sql - Group by column and select range of each group - 


id refid    date1  date2        nextdate 5   10  2008-02-21  2009-02-21  004/2008 6   10  2009-02-09  2010-02-09  002/2009 7   10  2010-02-08  2011-02-08  001/2010 10  11  2007-02-15  2008-02-15  002/2007 11  11  2008-02-21  2009-02-21  001/2008 12  11  2009-02-09  2010-02-09  001/2009 13  11  2010-02-09  2011-02-09  002/2010 14  11  2011-07-19  2012-07-19  054/2011 15  11  2012-07-17  2013-07-17  066/2012 18  14  2007-02-15  2008-02-15  006/2007 25  16  2007-02-15  2008-02-15  004/2007 27  16  2009-02-10  2010-02-10  004/2009 28  16  2010-02-12  2011-02-12  005/2010 29  16  2011-07-26  2012-07-26  055/2011 30  16  2012-07-18  2013-07-18  067/2012

i have datatable. need filter datatable following contitions. if refid have more 4 same values need first 1 , last 3. if have 4 , less same refid valuses nothing. result should this:

id   refid  date1   date2       nextdate 5   10  2008-02-21  2009-02-21  004/2008 6   10  2009-02-09  2010-02-09  002/2009 7   10  2010-02-08  2011-02-08  001/2010 10  11  2007-02-15  2008-02-15  002/2007 13  11  2010-02-09  2011-02-09  002/2010 14  11  2011-07-19  2012-07-19  054/2011 15  11  2012-07-17  2013-07-17  066/2012 18  14  2007-02-15  2008-02-15  006/2007 25  16  2007-02-15  2008-02-15  004/2007 28  16  2010-02-12  2011-02-12  005/2010 29  16  2011-07-26  2012-07-26  055/2011 30  16  2012-07-18  2013-07-18  067/2012

how that?

you can use row_number in cte:

with cte as(   select [id], [refid], [date1], [date2], [nextdate],      rn_asc = row_number()over(            partition refid            order id asc),       rn_desc = row_number()over(            partition refid            order id desc)   dbo.mytable ) select [id], [refid], [date1], [date2], [nextdate]  cte rn_asc = 1 or rn_desc <= 3 order [id]

demo

ranking functions (transact-sql)


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